Force is measured in which of the following units?

Force is defined as any interaction that, when unopposed, will change the motion of an object. The SI unit of force is the Newton (N), which is derived from the basic units of mass, length, and time in the International System of Units (SI). Specifically, one Newton is the amount of force required to accelerate a one-kilogram mass by one meter per second squared. Additionally, pound-force (lbf) is another unit used in the Imperial system to measure force, helping to highlight that force can be expressed in different systems of measurement.

Other units mentioned in the options are not used to measure force. Joules are a unit of energy, Pascals measure pressure (force per unit area), and Watts are units of power, which indicate rate of energy transfer. Understanding the definition and units of force is critical in various applications, especially in physics and engineering contexts related to motion and dynamics.